Atomic H-Induced Mo2C Hybrid as an Active and Stable Bifunctional Electrocatalyst

Fan, Xiujun; Liu, Yuanyue; Peng, Zhiwei; Zhang, Zhenhua; Zhou, Haiqing; Zhang, Xianming; Yakobson, Boris I.; Goddard, William A.; Guo, Xia; Hauge, Robert H.; Tour, James M.

doi:10.1021/acsnano.6b06089

Atomic H-Induced Mo₂C Hybrid as an Active and Stable Bifunctional Electrocatalyst

Journal Article · Sat Dec 17 23:00:00 EST 2016 · ACS Nano

DOI:https://doi.org/10.1021/acsnano.6b06089· OSTI ID:1487283

Fan, Xiujun ^[1]; ^[2]; Peng, Zhiwei ^[3]; Zhang, Zhenhua ^[4]; Zhou, Haiqing ^[5]; Zhang, Xianming ^[6]; Yakobson, Boris I. ^[7]; ^[8]; Guo, Xia ^[9]; Hauge, Robert H. ^[5]; ^[5]

Shanxi Univ. (China); Beijing Univ. of Technology (China); Rice Univ., Houston, TX (United States)
California Inst. of Technology (CalTech), Pasadena, CA (United States)
Rice Univ., Houston, TX (United States). Dept. of Chemistry
Beijing Univ. of Tech. (China). Inst. of Microstructure and Properties of Advanced Materials
Rice Univ., Houston, TX (United States). Dept. of Chemistry and Dept. of Materials Science and NanoEngineering
Shanxi Univ. (China)
Shanxi Univ. (China); Rice Univ., Houston, TX (United States)
California Inst. of Technology (CalTech), Pasadena, CA (United States). Materials and Process Simulation Center
Beijing Univ. of Tech. (China). College of Electronic Information and Control Engineering

Mo₂C nanocrystals (NCs) anchored on vertically aligned graphene nanoribbons (VA-GNR) as hybrid nanoelectrocatalysts (Mo₂C–GNR) are synthesized through the direct carbonization of metallic Mo with atomic H treatment. The growth mechanism of Mo₂C NCs with atomic H treatment is discussed. The Mo₂C–GNR hybrid exhibits highly active and durable electrocatalytic performance for the hydrogen-evolution reaction (HER) and oxygen-reduction reaction (ORR). For HER, in an acidic solution the Mo₂C–GNR has an onset potential of 39 mV and a Tafel slope of 65 mV dec^–1, and in a basic solution Mo₂C–GNR has an onset potential of 53 mV, and Tafel slope of 54 mV dec^–1. It is stable in both acidic and basic media. Mo₂C–GNR is a high-activity ORR catalyst with a high peak current density of 2.01 mA cm^–2, an onset potential of 0.93 V that is more positive vs reversible hydrogen electrode (RHE), a high electron transfer number n (~3.90), and long-term stability.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE); USDOE Office of Science (SC)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1487283

Journal Information:: ACS Nano, Journal Name: ACS Nano Journal Issue: 1 Vol. 11; ISSN 1936-0851

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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